integrate multiple Commerce Processes on the same CPQ Cloud site with the same Salesforce instance

Summary:

               Need a technical suggestion and help to integrate multiple Commerce Processes on the same CPQ Cloud site with the same Salesforce instance. But I am unable to figure out how SFDC team can call commerce flow based on a condition.

 Content (required):

                In our current client CPQ implementation, Sales Reps can navigate to CPQ by invoking ‘New’ button in Opportunity à Oracle Quote View. Going forward we want to point to particular Oracle CPQ commerce flow based on the Opportunity à BU field.

 Example if they Select BU as Hardware it has to navigate to Hardware commerce flow , if they select BU as Software it has to invoke Software commerce flow.